scholarly journals Some Physical Properties of Aqueous L-Ascorbic Acid Solutions

1979 ◽  
Vol 32 (10) ◽  
pp. 2293 ◽  
Author(s):  
M Shamim ◽  
SB Khoo
Keyword(s):  
Ascorbic Acid ◽  
Refractive Index ◽  
Physical Properties ◽  
Infinite Dilution ◽  
Relative Viscosity ◽  
Partial Molal Volume ◽  
Acid Solutions ◽  
Molal Volume ◽  
Undissociated Acid

The density, viscosity and refractive index of aqueous L-ascorbic acid solutions, in the concentration range 0.01-1.20 M, have been measured at 25�C. The partial molal volume of the undissociated acid at infinite dilution has been found to be 105.74 cm3 mol-1. Equations which describe the density and relative viscosity of the solutions have also been given.

scholarly journals MOLECULAR INTERACTION STUDIES OF ZWITTER- ION IN AQUEOUS SUCROSE AND ASCORBIC ACID AT CONSTANT TEMPERATURE

2018 ◽  
Vol 6 (9) ◽  
pp. 356-363
Author(s):  
Yasmin Akhtar
Keyword(s):  
Ascorbic Acid ◽  
Hydration Number ◽  
Ternary Systems ◽  
Partial Molal Volume ◽  
Acid Solutions ◽  
Molal Volume ◽  
Solvent Interaction ◽  
Bonding Effect ◽  
Zwitter Ion ◽  
Hydrogen Bonding Effect

Density and viscosity of L-Arginine in aqueous sucrose and ascorbic acid  solutions have been determined experimentally at 298 K. The results obtained from density and viscosity measurement have been used to calculate the Hydration number Hn, apparent molar volume фv, partial molal volume ф0v , at infinite dilution, transfer volume ∆ф0tr   and B- coefficient. It has been observed that there exist strong solute-solvent interaction and complex formation between in these ternary systems. The properties of this amino acid in water and aqueous sucrose and ascorbic acid systems are discussed in terms of the charge, size and hydrogen bonding effect.

scholarly journals INTERACTION STUDIES OF AMINO ACIDS IN AQUEOUS SODIUM BROMIDE SOLUTIONS AT DIFFERENT TEMPERATURE

2017 ◽  
Vol 5 (10) ◽  
pp. 160-167
Author(s):  
Yasmin Akhtar
Keyword(s):  
Amino Acids ◽  
Infinite Dilution ◽  
Adiabatic Compressibility ◽  
Sodium Bromide ◽  
Apparent Molal Volume ◽  
Partial Molal Volume ◽  
Molal Volume ◽  
Solvent Interactions ◽  
Aqueous Sodium ◽  
Bonding Effect

Densities, ultrasonic velocities and viscosities of L- Valine and L- Phenylalanine in aqueous sodium bromide (0.00, 0.025 and 0.05) m solutions have been determined experimentally at 308 and 313 K. The results obtained from density ultrasonic velocity and viscosity measurement have been used to calculate the apparent molal volume, фv, apparent molal, adiabatic compressibility ф Ks, partial molal volume ф0v at infinite dilution, partial molal adiabatic compressibility ф0Ks at infinite dilution, transfer volume ∆ф(tr), experimental slopes Sv and SKs,Falkenhagen coefficient A and  Jones-Dole B coefficient. The results are discussed in terms of the dehydration effect of the sodium bromide upon the amino acids and weak solute- solute and strong solute- solvent interactions. The properties of these amino acids in water and water + sodium bromide solution systems are discussed in terms of the charge, size and hydrogen bonding effect.

scholarly journals A volumetric and viscometric study of 4-aminobutyric acid in aqueous solutions of metformin hydrochloride at 308.15, 313.15 and 318.15k

2011 ◽  
Vol 76 (1) ◽  
pp. 129-142 ◽  
Author(s):  
K. Rajagopal ◽  
S.S. Jayabalakrishnan
Keyword(s):  
Infinite Dilution ◽  
Hydration Number ◽  
Aminobutyric Acid ◽  
Metformin Hydrochloride ◽  
Second Derivative ◽  
Partial Molal Volume ◽  
Molal Volume ◽  
Free Energy Of Activation ◽  
Volume Of Transfer ◽  
Viscometric Study

Density(?) and viscosity (?) measurements were performed for 4-aminobutyric acid in 0.05, 0.10 and 0.15 M aqueous metformin hydrochloride at 308.15, 313.15 and 318.15 K. The measured values of density and viscosity were used to estimate some important parameters, such as the partial molal volume, V?, the standard partial molal volume V0? , the standard partial molal volume of transfer, ?V0?, the hydration number, nH, the second derivative of the infinite dilution of the standard partial molal volume with temperature ?2V0?/?T2, the viscosity Bcoefficients, variation of B with temperature, dB/dT , the free energy of activation per mole of solvent ??01

scholarly journals Study of Physical Properties for Sodium acetate with Water and Water - Acetone mixtures at Different Temperatures

2017 ◽  
Vol 27 (4) ◽  
Author(s):  
Ahmed Mohammed Abbas ◽  
Zainab Wajdi Ahmed ◽  
Alaa Fadhil Sulaiman ◽  
Issam AbdalKreem AbdalLatif
Keyword(s):  
Sodium Acetate ◽  
Apparent Molal Volume ◽  
Viscosity Data ◽  
Partial Molal Volume ◽  
Molal Volume ◽  
Solvent Interactions ◽  
Acetone Water ◽  
Thermodynamic Activation Parameter ◽  
Different Temperatures ◽  
Apparent Molal Compressibility

In this study binary and ternary solutions are prepared by using the sodium acetate concentrations (0.1, 0.125, 0.2, 0.25, 0.4, 0.5, 0.8, 1 M) in water and acetone –water mixtures .The important parameters such as apparent molal volume, the partial molal volume transfer,  apparent  molal compressibility, free energy of activation of viscous flow and thermodynamic activation parameter (enthalpy and entropy) determined of sodium acetate in water , 20%, 40% ,60% and 80% V/V acetone –water mixtures at 298.15K, 303.15K, and 308.15K from density and viscosity measurements espectively. The limiting apparent molal volumes and experimental slopes were derived from the Masson equation, have been interpreted in terms of solute–solvent and solute–solute interactions  respectively. The viscosity data were analyzed using theJones–Dole equation and the derived parameter B - coefficient has also been interpreted in terms of solute–solvent interactions in the solutions. 

The anaerobic decomposition of ascorbic acid in the pH range of foods and in more acid solutions

1971 ◽  
Vol 22 (10) ◽  
pp. 540-542 ◽  
Author(s):  
F. E. Huelin ◽  
I. M. Coggiola ◽  
G. S. Sidhu ◽  
H. Kennett
Keyword(s):  
Ascorbic Acid ◽  
Acid Solutions ◽  
Anaerobic Decomposition ◽  
Ph Range

Solvent-induced stresses in glassy polymer: Elastic model

1999 ◽  
Vol 14 (10) ◽  
pp. 4111-4118 ◽  
Author(s):  
Wei-Lung Wang ◽  
J. R. Chen ◽  
Sanboh Lee
Keyword(s):  
Mass Transport ◽  
Surface Concentration ◽  
Anomalous Transport ◽  
Initial Time ◽  
Elastic Model ◽  
Partial Molal Volume ◽  
Longitudinal Displacement ◽  
Linear Elasticity Theory ◽  
Molal Volume ◽  
Induced Stresses

The solvent-induced stresses in glassy polymers were investigated. The mass transport accounts for case I, case II, and anomalous transport. Case I transport is attributed to the concentration gradient, whereas case II transport is attributed to stress relaxation. Anomalous transport is the mixture of case I and case II. Both one-side and two-side mass transports with the boundary condition of constant surface concentration are considered. The stresses and longitudinal displacement arising from the mass transport are formulated based on the linear elasticity theory. The maximum stress is always located at the surface at the initial time. The stresses are a function of the partial molal volume, Young's modulus, and Poisson's ratio. From the longitudinal displacement data, the partial molal volume was determined.

Heat capacities and volumes of some non-electrolytes in N,N-dimethylformamide at 298.15 K

1987 ◽  
Vol 65 (12) ◽  
pp. 2810-2814 ◽  
Author(s):  
Henryk Piekarski
Keyword(s):  
Ethylene Glycol ◽  
Heat Capacities ◽  
Scaled Particle Theory ◽  
Partial Molal Volume ◽  
Cavity Formation ◽  
Particle Theory ◽  
Molal Volume ◽  
Analogous Data ◽  
Other Substances ◽  
Apparent Molal Heat Capacities

Heat capacities and densities of dilute solutions of formamide, acetone, tetrahydrofuran, ethylene glycol, 2-methoxyethanol, and 2-ethoxyethanol in N,N-dimethylformamide were determined at 298.15 K. Apparent molal heat capacities and volumes for these solutes in DMF were calculated and compared with the analogous data for other substances in DMF solution as well as with the data concerning solutions in methanol and water. Heat capacities of cavity formation (ΔCcav) in DMF were calculated on the basis of the Scaled Particle Theory. ΔCcav appeared to be linearly correlated with the standard partial molal volume of corresponding solutes in DMF. Similar dependences were also found for aqueous and methanolic solutions of the non-electrolytes.

QDs Based Photoelectrochemical Sensors for Detection of Ascorbic Acid

2021 ◽  
Vol 1033 ◽  
pp. 77-81
Author(s):  
Li Ping Tu ◽  
Guo Wei Xu
Keyword(s):  
Quantum Dots ◽  
Ascorbic Acid ◽  
Acid Concentration ◽  
Bias Voltage ◽  
Fabrication Process ◽  
Acid Solutions ◽  
Ascorbic Acid Concentration ◽  
Detection Range ◽  
Photoelectrochemical Sensor ◽  
Ascorbic Acid Sensor

By fixing Quantum Dots (QDs) on gold electrodes with dithiol compounds, a novel Ascorbic Acid sensor without any redox mediator was desighed. First, the fabrication process of sensor was described.Sencond, the characteristics of the sensor were investigated. Third,the sensor was tested in Ascorbic Acid solutions of different concentrations.From the results,it shows that the performance of photoelectrochemical sensor were influenced by the bias voltage and the amplitude of photocurrent changed with the Ascorbic Acid concentration linearly in detection range.

Sign in / Sign up

Export Citation Format

Share Document